Note: A flex fuel sensor is not included with purchase of the Zeitronix Ethanol Content Analyzer. This GM ethanol sensor is required in order to display the content on the ECA

Sensors are standard components of many flex fuel vehicles or may be purchased separately at GM dealerships (GM part number 12568450 or 12570260).

What's your ethanol percentage?
The ethanol content of E85 fuel can vary from 60% to 92% ethanol. A fill up with E85 can drastically change the mix of fuel in your vehicle. For performance drivers determining actual ethanol content of E85 is essential to maximizing an engine tune and horsepower.

Why know your ethanol percentage?
E85 has the equivalent octane rating of 105 octane gasoline. Higher octane fuel is more resistant to knock allowing for more aggressive ignition timing, higher compression and increased engine power over gasoline itself. The Zeitronix Ethanol Content Analyzer helps you get the most out of your engine and fuel.

Which vehicles have the flex fuel sensors?
A partial listing of vehicles with flex fuel sensors is listed below. Newer vehicles with the capability for using E85 also use flex fuel sensors. Check for sensors with the following part numbers: 12568450 or 12570260. A picture of the sensor is given to the right and dimensions of the sensor are also given below.